While inspecting the genome sequence of your newly discovered organism, you note that while the genome overall is 50% G + C, there is a cluster of genes comprising about 20,000 bp that is 64% G + C. The best explanation for this is:A) this represents normal variation within a chromosome. B) the 20,000 bp segment likely contains a cluster of housekeeping genes. C) the 20,000 bp segment is an adaptation to a more thermophilic environment. D) the 20,000 bp segment is a recent acquisition via horizontal gene transfer.